transform | R Documentation |
Transform OAI-PMH XML results to “useful” R data structures (lists of character vectors or XML nodes) for further processing or analysis.
oaih_transform(x)
x |
an XML node, or a list of character vectors or XML nodes. |
In a “list context”, i.e., if x
conceptually contains
information on several cases, transformation gives a “list
matrix” (a list of character vector or XML node observations with a
dim attribute) providing a rectangular case by variables data layout;
otherwise, a list of variables. See the vignette for details.
A list of character vectors or XML nodes, arranged as a matrix in the “list context”.
tryCatch({ ## Run inside tryCatch() so that checks fail gracefully if OAI-PMH ## requests time out or fail otherwise. baseurl <- "https://research.wu.ac.at/ws/oai" ## Get a single record to save bandwidth. x <- oaih_get_record(baseurl, "oai:research.wu.ac.at:publications/783bfc47-bf51-454d-8b78-33fd63243e48", transform = FALSE) ## The result of the request is a single OAI-PMH XML <record> node: x ## Transform this (turning identifier, datestamp and setSpec into ## character data): x <- oaih_transform(x) x ## This has its metadata in the default Dublin Core form, encoded in ## XML. Transform these to character data: oaih_transform(x$metadata) ## }, error = identity)
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